<!DOCTYPE html>
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <title>💗爱心烟花</title>
  <style type="text/css">
    body {
      margin: 0;
      overflow: hidden;
      background: #000;
    }
    canvas {
      position: absolute;
      width: 100%;
      height: 100%;
    }
    #pinkboard {
      animation: anim 1.5s ease-in-out infinite;
      -webkit-animation: anim 1.5s ease-in-out infinite;
      -o-animation: anim 1.5s ease-in-out infinite;
      -moz-animation: anim 1.5s ease-in-out infinite;
    }
    @keyframes anim {
      0% { transform: scale(0.8); }
      25% { transform: scale(0.7); }
      50% { transform: scale(1); }
      75% { transform: scale(0.7); }
      100% { transform: scale(0.8); }
    }
    @-webkit-keyframes anim {
      0% { -webkit-transform: scale(0.8); }
      25% { -webkit-transform: scale(0.7); }
      50% { -webkit-transform: scale(1); }
      75% { -webkit-transform: scale(0.7); }
      100% { -webkit-transform: scale(0.8); }
    }
    @-o-keyframes anim {
      0% { -o-transform: scale(0.8); }
      25% { -o-transform: scale(0.7); }
      50% { -o-transform: scale(1); }
      75% { -o-transform: scale(0.7); }
      100% { -o-transform: scale(0.8); }
    }
    @-moz-keyframes anim {
      0% { -moz-transform: scale(0.8); }
      25% { -moz-transform: scale(0.7); }
      50% { -moz-transform: scale(1); }
      75% { -moz-transform: scale(0.7); }
      100% { -moz-transform: scale(0.8); }
    }
    #name {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      margin-top: -20px;
      font-size: 46px;
      color: pink;
      z-index: 100;
    }
  </style>
</head>
<body>
<canvas id="pinkboard" width="1920" height="947"></canvas>
<div id="name">❤我爱你❤</div>
<canvas id="canvas" width="1920" height="947"></canvas>

<script type="text/javascript">
  const colors = [
    "#eec996", "#8fb7d3", "#b7d4c6", "#c3bedd", "#f1d5e4",
    "#cae1d3", "#f3c89d", "#d0b0c3", "#819d53", "#c99294",
    "#cec884", "#ff8e70", "#e0a111", "#fffdf6", "#cbd7ac",
    "#e8c6c0", "#dc9898", "#ecc8ba",
  ];

  var canvas = document.getElementById("canvas");
  var ctx = canvas.getContext("2d");
  let count = 1;
  var ww = window.innerWidth;
  var wh = window.innerHeight;
  var hearts = [];

  function init() {
    requestAnimationFrame(render);
    canvas.width = ww;
    canvas.height = wh;
    for (var i = 0; i < 100; i++) {
      hearts.push(new Heart());
    }
  }

  function Heart() {
    this.x = Math.random() * ww;
    this.y = Math.random() * wh;
    this.opacity = Math.random() * 0.5 + 0.5;
    this.vel = {
      x: (Math.random() - 0.5) * 4,
      y: (Math.random() - 0.5) * 4,
    };
    this.targetScale = Math.random() * 0.15 + 0.02;
    this.scale = this.targetScale * Math.random();
  }

  Heart.prototype.update = function (i) {
    this.x += this.vel.x;
    this.y += this.vel.y;
    this.scale += (this.targetScale - this.scale) * 0.01;
    if (this.x - this.width > ww || this.x + this.width < 0) {
      this.scale = 0;
      this.x = Math.random() * ww;
    }
    if (this.y - this.height > wh || this.y + this.height < 0) {
      this.scale = 0;
      this.y = Math.random() * wh;
    }
    this.width = 470;
    this.height = 400;
  };

  Heart.prototype.draw = function (i) {
    ctx.globalAlpha = this.opacity;
    ctx.font = `${180 * this.scale}px "微软雅黑"`;
    ctx.fillStyle = colors[i % 18];
    ctx.fillText(
            "❤🌋田胜斌要快乐❤",  // 这里可以修改烟花中的文字
            this.x - this.width * 0.5,
            this.y - this.height * 0.5,
            this.width,
            this.height
    );
  };

  function render() {
    ctx.clearRect(0, 0, ww, wh);
    for (var i = 0; i < 100; i++) {
      hearts[i].update(i);
      hearts[i].draw(i);
    }
    requestAnimationFrame(render);
  }

  init();
  window.addEventListener("resize", function () {
    ww = window.innerWidth;
    wh = window.innerHeight;
  });
</script>

<script>
  var settings = {
    particles: {
      length: 500,
      duration: 4,
      velocity: 100,
      effect: -0.75,
      size: 30,
    },
  };

  (function () {
    var b = 0;
    var c = ["ms", "moz", "webkit", "o"];
    for (var a = 0; a < c.length && !window.requestAnimationFrame; ++a) {
      window.requestAnimationFrame = window[c[a] + "RequestAnimationFrame"];
      window.cancelAnimationFrame = window[c[a] + "CancelAnimationFrame"] || window[c[a] + "CancelRequestAnimationFrame"];
    }
    if (!window.requestAnimationFrame) {
      window.requestAnimationFrame = function (h, e) {
        var d = new Date().getTime();
        var f = Math.max(0, 16 - (d - b));
        var g = window.setTimeout(function () {
          h(d + f);
        }, f);
        b = d + f;
        return g;
      };
    }
    if (!window.cancelAnimationFrame) {
      window.cancelAnimationFrame = function (d) {
        clearTimeout(d);
      };
    }
  })();

  var Point = (function () {
    function Point(x, y) {
      this.x = typeof x !== "undefined" ? x : 0;
      this.y = typeof y !== "undefined" ? y : 0;
    }
    Point.prototype.clone = function () {
      return new Point(this.x, this.y);
    };
    Point.prototype.length = function (length) {
      if (typeof length == "undefined") return Math.sqrt(this.x * this.x + this.y * this.y);
      this.normalize();
      this.x *= length;
      this.y *= length;
      return this;
    };
    Point.prototype.normalize = function () {
      var length = this.length();
      this.x /= length;
      this.y /= length;
      return this;
    };
    return Point;
  })();

  var Particle = (function () {
    function Particle() {
      this.position = new Point();
      this.velocity = new Point();
      this.acceleration = new Point();
      this.age = 0;
    }
    Particle.prototype.initialize = function (x, y, dx, dy) {
      this.position.x = x;
      this.position.y = y;
      this.velocity.x = dx;
      this.velocity.y = dy;
      this.acceleration.x = dx * settings.particles.effect;
      this.acceleration.y = dy * settings.particles.effect;
      this.age = 0;
    };
    Particle.prototype.update = function (deltaTime) {
      this.position.x += this.velocity.x * deltaTime;
      this.position.y += this.velocity.y * deltaTime;
      this.velocity.x += this.acceleration.x * deltaTime;
      this.velocity.y += this.acceleration.y * deltaTime;
      this.age += deltaTime;
    };
    Particle.prototype.draw = function (context, image) {
      function ease(t) {
        return --t * t * t + 1;
      }
      var size = image.width * ease(this.age / settings.particles.duration);
      context.globalAlpha = 1 - this.age / settings.particles.duration;
      context.drawImage(
              image,
              this.position.x - size / 2,
              this.position.y - size / 2,
              size,
              size
      );
    };
    return Particle;
  })();

  var ParticlePool = (function () {
    var particles,
            firstActive = 0,
            firstFree = 0,
            duration = settings.particles.duration;

    function ParticlePool(length) {
      particles = new Array(length);
      for (var i = 0; i < particles.length; i++) particles[i] = new Particle();
    }

    ParticlePool.prototype.add = function (x, y, dx, dy) {
      particles[firstFree].initialize(x, y, dx, dy);
      firstFree++;
      if (firstFree == particles.length) firstFree = 0;
      if (firstActive == firstFree) firstActive++;
      if (firstActive == particles.length) firstActive = 0;
    };

    ParticlePool.prototype.update = function (deltaTime) {
      var i;
      if (firstActive < firstFree) {
        for (i = firstActive; i < firstFree; i++) particles[i].update(deltaTime);
      }
      if (firstFree < firstActive) {
        for (i = firstActive; i < particles.length; i++) particles[i].update(deltaTime);
        for (i = 0; i < firstFree; i++) particles[i].update(deltaTime);
      }

      while (
              particles[firstActive].age >= duration &&
              firstActive != firstFree
              ) {
        firstActive++;
        if (firstActive == particles.length) firstActive = 0;
      }
    };

    ParticlePool.prototype.draw = function (context, image) {
      if (firstActive < firstFree) {
        for (i = firstActive; i < firstFree; i++) particles[i].draw(context, image);
      }
      if (firstFree < firstActive) {
        for (i = firstActive; i < particles.length; i++) particles[i].draw(context, image);
        for (i = 0; i < firstFree; i++) particles[i].draw(context, image);
      }
    };

    return ParticlePool;
  })();

  (function (canvas) {
    var context = canvas.getContext("2d"),
            particles = new ParticlePool(settings.particles.length),
            particleRate = settings.particles.length / settings.particles.duration, // particles/sec
            time;

    function pointOnHeart(t) {
      return new Point(
              160 * Math.pow(Math.sin(t), 3),
              130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25
      );
    }

    var image = (function () {
      var canvas = document.createElement("canvas"),
              context = canvas.getContext("2d");
      canvas.width = settings.particles.size;
      canvas.height = settings.particles.size;

      function to(t) {
        var point = pointOnHeart(t);
        point.x =
                settings.particles.size / 2 +
                (point.x * settings.particles.size) / 350;
        point.y =
                settings.particles.size / 2 -
                (point.y * settings.particles.size) / 350;
        return point;
      }

      context.beginPath();
      var t = -Math.PI;
      var point = to(t);
      context.moveTo(point.x, point.y);
      while (t < Math.PI) {
        t += 0.01;
        point = to(t);
        context.lineTo(point.x, point.y);
      }
      context.closePath();
      context.fillStyle = "pink";
      context.fill();
      var image = new Image();
      image.src = canvas.toDataURL();
      return image;
    })();

    function render() {
      requestAnimationFrame(render);
      var newTime = new Date().getTime() / 1000,
              deltaTime = newTime - (time || newTime);
      time = newTime;

      context.clearRect(0, 0, canvas.width, canvas.height);
      var amount = particleRate * deltaTime;
      for (var i = 0; i < amount; i++) {
        var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());
        var dir = pos.clone().length(settings.particles.velocity);
        particles.add(
                canvas.width / 2 + pos.x,
                canvas.height / 2 - pos.y,
                dir.x,
                -dir.y
        );
      }
      particles.update(deltaTime);
      particles.draw(context, image);
    }

    function onResize() {
      canvas.width = canvas.clientWidth;
      canvas.height = canvas.clientHeight;
    }

    window.onresize = onResize;
    setTimeout(function () {
      onResize();
      render();
    }, 10);
  })(document.getElementById("pinkboard"));
</script>
</body>
</html>